Fig. 6
From: How to locate the dural defect in a spinal extradural meningeal cyst: a literature review
Two-needle puncture digital subtraction myelography technology. A 35-year-old woman had low back pain for 4 years. A Preoperative MRI revealed a butterfly vertebra and a SEMC. B and C We performed two-needle puncture digital subtraction myelography which failed. D and E No cleft was found during digital subtraction myelography. F The cleft was found during intraoperative exploration. The drawback of these digital subtraction contrast examination techniques is that the boundary of the subarachnoid space and cyst cannot be shown